The spelling of the word "diels" might seem confusing, but it follows the rules of English phonetics. The correct IPA phonetic transcription for "diels" is /diːlz/. The first part of the word is pronounced as "dee" (/diː/) and the last part is pronounced as "ls" (/lz/). This spelling is in accordance with the English rule that when "ie" follows "d," "t," "n," or "l," the "i" is pronounced as a long "e" sound. Therefore, "diels" is correctly pronounced as "deels."